Billy Conn
— Billy Conn
Jean Parker
— Patricia Mallory
Dick Purcell
— Cliff Halliday
Alan Baxter
— Joe Barton
Veda Ann Borg
— Barbara Ellison
Jonathan Hale
— Max Ellison
Ernest Whitman
— Feets Johnson
John Kelly
— Knockout Riley
Etta McDaniel
— Magenta
Dick Elliott
— Garvey
John Harmon
— Morrie
Robert Barron
— Devlin
Henry Armstrong
— Sparring Partner
Sam Balter
— Radio announcer (voice)
Arthur Donovan
— Referee
Jack Roper
— The Champ
Freddie Steele
— Freddie Steel
Dan Tobey
— Fight Announcer
Edmund Cobb
— (uncredited)
Donald Douglas
— (uncredited)
William Forrest
— (uncredited)
Harrison Greene
— (uncredited)
Kit Guard
— (uncredited)
Russell Hicks
— (uncredited)
Nora Lane
— (uncredited)
Charles Sullivan
— (uncredited)
William Telaak
— (uncredited)